Wireless-telegraph system.



No. 699,l58. Patented May 6, I902. c. n. EHRET.

WIRELESS TELEGRAPH SYSTEM.

(Application filed Dec. 8, 1901.)

(No Model.)

UNIT D "STATES- PATENT OFFrcE.

CORNELIUS D. EHRET, OF WASHINGTON, DISTRICT OF COLUMBIA, AS-

SIGNOR OF ONE-HALF TO AMERICAN WIRELESS TELEPHONE AND I TELEGRAPH 1COMPANY, A CORPORATION OF ARIZONA TERRITORY..

WlRE LESfS-TELE'G RAPH SYSTEM.

SPECIFICATION formingpart a Letters Patent- No. 699,1 58, dated May 6, 1902.

Application filed December 3. 1901I Serial No. 84,513. (No model.)

To ctZZ whom it may concern.-

Be it known that I, CORNELIUS D. EHRET, a citizen of the United States,residing at Washington, District of Columbia, have invented certainnewand usefullmprovements in Wireless-Telegraph Systems, of which thefollowing is a specification.

My invention relates to wireless telegraphy,

andmore especially to'the apparatus at the receiving-station.

It comprises, essentially, two dissimilar wave-responsive devices whichjointly control local circuits to produce the signals.

It further comprises a wireless-telegraph receiver which is operated bythe simultaneous reception of electromagnetic waves of differentfrequencies,the waves of difierent frequencies operating upon dissimilarwave-responsive devices, such devices being in local circuits by whichare produced the signals.

so far as I am aware up to the present time but'one type ofwave-responsive device has been used in any receiving instrument, suchdevice comprising either the well-known filings-coherer, which has theproperty of losing its resistance under'the influence of waves,

- or the anticoherers,which have the property of increasing theirresistance under the influence of waves. I propose to use in a singlereceiving device wave-responsive devices of both types,thereby securing,in effect, greater sensitiveness and longer range in the useofwireless-telegraph apparatus.

For a detail description of my invention reference is to be had to theaccompanying drawings, in which Figure 1 is a diagrammatic view showinga wireless-telegraph receiving-stationembodyingdissimilarwave-responsive devices. Figs. 2, 3, 4, 5, and 6are'modifications showing different arrangements of the wave-responsivedevices. Fig. v7 is a diagrammatic view of a system in which waves oftwo frequencies are 1 received and each of the dissimilarwave-responsive devices is operated upon by the waves of each frequency.

a is the usual aerial conductor of a' wireless-telegraph system, whichis connected to 2artl through the wave-responsive devices an e.

R is polarized and normally tends to attract armature 4 against stop 6in opposition to the tension of the spring 7.

The device b is normally conducting and permits a current from battery13 to continuously circulate, through coil g,which is wound in such adirection as to aid the permanent magnetism of the core 3. The coil fand its associated battery B are so disposed as to prod uce ampere-turnsin opposition to the coil g. Normally, however, there is no current incoil f. g

Upon the reception of Hertzian waves upon the aerial conductor a coherer0 becomes conductive, and the device 1) increases greatly in resistanceandpractically opens the circuit of the coil g. The result'is that thepull upon the armature 4 is diminished, due to the loss of magnetismnormally produced by coil 9,

and the magnetism of core 3 is in addition reversed by coil f, resulting'in the release of armature 4: to the pull exerted by spring 7, whichcauses armature 4 to make contact with screw 5 and close the localcircuit through recording device S and batteryB, producing a signal.

As a modification. core 3 maybe made of soft iron, in which casearmature 4 should be polarized in such manner that normally it isattracted against stop '6, due 'to'the effect of coil 9 and itsown'magnetism. f

In Fig. 1 the receiving devicesb and c'have In Fig; 3 I have shown twodevices 6 in'para allel connected in series with two coherers c, whichare in parallel.

In Fig. 4 I have shown two devices I) in parallel with each other and inparallel with two coherers c, which are in parallel with each other.

It is to be understood that the disposition of the batteries B and B inFigs. 3 and 4 is such that in combination with the coils f and 9 theyproduce the result described in Fig.

1that is, the coils f and g always act in opposition to each other,whether wound in opposition to each other or not.

In Fig. 5 I have shown in series with the aerial conductor a thewave-conducting device h and coherer c. The device h is a sheet of thinmetal transversely slitted corresponding to the member 2 of device I).Here again the coils f and g of the relay R oppose each other to thesame end as described in Fig. 1.

Fig. 6 is similar to Fig. 5, with the exception that a split battery B Bis used. In this case the coils fg are wound in the same direction; butfrom the arrangement of the split battery shown their magnetizingeffects are opposed to each other.

In Fig. 7, a is the usual aerial conductor, having a certain capacity,and in series with it are the inductances L L, which are in parallelwith each other and which connect to earth through I) andc,respectively. The conductor a and inductance L form together a circuitwhich is selective of one of the frequencies received,while a and theinductance L is selective of the other frequency. The devices I) andc,with their associated batteries 13 and B, control a relay in the samemanner as described in connection with Fig. 1that is, the coilcontrolled by c is opposed to the coil controlled by b.

Other devices than the slitted foil detectors 1) and It may be used intheir stead, it being understood that for Z) or it may be substitutedany anticoherer, many forms of which are known in the art of wirelesstelegraphy, such as the electrolytic anticoherer.

Likewise the device a may be one of many forms of wave-responsivedevices well known in the art, which have the property of diminishing inresistance under the influence of Hertzian waves.

It is preferable in cases where the two dissimilar wave-responsivedevices are in series relation to have the one which loses itsresistance connected in the circuit next to the aerial conductor itselfand the anticoherer next to the ground connection.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In a signaling system, the combination of dissimilar wave-responsivedevices conjointly controlling a translating device.

2. In a signaling system, the combination of dissimilar wave-responsivedevices each having associated therewith a local circuit, said circuitsbeing conjointly operative to produce a signal.

3. In a signaling system, the combination of dissimilar wave-responsivedevices, and means controlled by each type of device, said meansoperating conjointly to produce a signal.

4. In a signaling system, the combination of dissimilar wave-responsivedevices, and separate means controlled by each type of device, saidmeans operating conjointly to produce a signal.

5. In a signaling system, a receiver selective of waves of two or moreperiodicities; dissimilar wave-responsive devices influenced by thewaves of different frequencies; and separate means controlled by saidwave-responsive devices, said means operating conjointly to produce asignal.

6. In a signaling system, the combination of dissimilar wave -detectingdevices, and local circuits controlled by said devices, each of saidcircuits including a coil of a relay, said coils operatingdifferentially on the mag netic circuit of said relay, substantially asdescribed.

7. In a receiver, the combination of a coherer and an anticohererconjointly controlling a translating device.

8. In a receiver, .the combination of a co herer and an anticoherer, alocal circuit associated with each, and means for producing a signalcontrolled by said local circuits.

9. In a receiver, a coherer and an anticoherer, means controlled byeach, said means operating conjointly to produce a signal.

10. In a receiver, the combination of a coherer and an anticoherer, aseparate means controlled by each, said means operating conjointly toproduce a signal.

11. A receiver selective of energies of different frequencies; a cohererand an antico herer influenced respectively by the diiferent energies,and means, conjointly operative to produce a signal, controlled by thecoherer and anticoherer.

12. In a receiver, the combination of a coherer and an anticoher, alocal circuit controlled by each, a coil of a relay included in eachcircuit,said coils operating differentially on the magnetic circuit ofsaid relay, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CORNELIUS D. EI-IRET.

Witnesses:

R. H. STROTHER, F. A. FENNING.

